Flashed Ubuntu Touch on my Nexus 7. The lag was atrocious, most of the apps were either just blank icons which did nothing or a link to a website. Nothing close to customisable, everything on it were example notifications, messages, etc. Similar to a demo, rather than developer preview. Even the calculator app was not actually a calculator, it was a picture of a calculator. The only thing remotely accessible Settings-wise were the notification volume and brightness controls.
Samsung Galaxy S 4 I337M (jfltecan) | CM11 Nightlies
Google Nexus 7 (grouper) | CM11 Nightlies
Samsung Galaxy S III T999V (d2tmo) | CM 10.2.0
HTC MyTouch 4G Slide (doubleshot) | CM 10 Unofficial
HTC Amaze 4G (ruby) | CM10 Unofficial
HTC Panache/MyTouch 4G (glacier) | Virtuous Affinity 2.05.0
HTC Hero GSM (hero) | CM7.2 Stable